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We use QCD light-cone sum rules (LCSR) with holographic anti deSitter/Chromodynamics (AdS/QCD) Distribution Amplitudes (DAs) for the $\rho$meson to predict the form factors that govern the leading amplitudes of therare radiative $B -> \rho \gamma$ decay and the semileptonic decay $B -> \rho l\nu$. We test the Isgur-Wise relation between the radiative and semileptonicform factors. We also compute the total width (in units of $|V_{ub}|^2$) forthe semileptonic decay $B -> \rho l \nu$ as well as ratios of partial decaywidths which are independent of $|V_{ub}|$.

Predicting the $B -> \rho$ form factors using AdS/QCD Distribution Amplitudes for the $\rho$ meson